change init_rtt after path receive PATH_RESPONSE frame

[Thuwzq]

resolve #344

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.22%. Comparing base (7f37ff2) to head (2d7eb7e).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #349      +/-   ##
===========================================
- Coverage    95.25%   95.22%   -0.03%     
===========================================
  Files           50       50              
  Lines        33740    33772      +32     
===========================================
+ Hits         32139    32161      +22     
- Misses        1601     1611      +10     

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